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Cat security shield blocking O2 sensor access

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by babouzy, Dec 8, 2022.

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  1. babouzy

    babouzy New Member

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    I have a 2007 Prius with the ccm cat security shield. I need to replace the downstream o2 sensor but the shield blocks access to it. I had it on the lift in my auto shop class. I have my last class session and the new o2 sensor in hand. Anybody know a solution to access the o2 sensor? Seems like a bad design flaw. Maybe I could unbold the 4 screws ant the front and bend the shield down, then bend it back when done. I don’t want to completely remove the shield because of the rivets and the hassle of trying to put it back on with limited knowledge time and tools.
     
    #1 babouzy, Dec 8, 2022
  2. dolj

    dolj Senior Member

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    It is deliberately made to be difficult to access. The rear O2 sensor is right by the front catalytic converter.

    You could always design and install a service hatch that did not compromise the overall security of the catalytic converters.
     
    #2 dolj, Dec 9, 2022
  3. swooshrc

    swooshrc New Member

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    I remove the back 6 screws with the supplied security driver, then bend the shield down.
     
    #3 swooshrc, Dec 11, 2022
    bisco likes this.
  4. BiomedO1

    BiomedO1 Senior Member

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    Sorry, late to the party.
    You can just take a 1/2 inch drill bit to drill the heads off the rivets. The shield should come down and just rivet it back into place.

    When I installed my shield, I installed it with security screws and dropped the bit in my glove box. It's in the little baggie with my lug nut security bit.
     
    #4 BiomedO1, Jan 20, 2023
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